Billionaire investor Carl Icahn tweeted back in August that he had taken “a large position” in Apple, but we didn’t know at the time what the number was, beyond speculation that it was more than $1B.

A regulatory filing now reveals that he purchased 3.88M shares, which at the time would have been worth $1.85B, reports Business Insider. With the increase in AAPL’s stock price, and additional purchases Icahn made since, it’s estimated that he now holds around $2.5B worth of Apple shares.